CVE-2025-26596

Xorg: xwayland: heap overflow in xkbwritekeysyms()

State: Published
Severity: 7.8 High
Published: Feb 25, 2025
Updated: Jun 29, 2026
Reserved: Feb 12, 2025

Description

A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms() differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer overflow.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	redhat

Weaknesses

CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
xserver	before 21.1.16Affected 22.0.0 to before 24.1.6Affected
Red Hat Enterprise Linux 10Red Hat	0:24.1.5-3.el10_0 and laterNot affected
Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONRed Hat	0:1.1.0-25.el6_10 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:1.8.0-36.el7_9 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:1.20.4-30.el7_9 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:1.13.1-15.el8_10 and laterNot affected
Red Hat Enterprise Linux 8.2 Advanced Update SupportRed Hat	0:1.9.0-15.el8_2.13 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:1.11.0-8.el8_4.12 and laterNot affected
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRed Hat	0:1.11.0-8.el8_4.12 and laterNot affected
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRed Hat	0:1.11.0-8.el8_4.12 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:1.12.0-6.el8_6.13 and laterNot affected
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRed Hat	0:1.12.0-6.el8_6.13 and laterNot affected
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRed Hat	0:1.12.0-6.el8_6.13 and laterNot affected
Red Hat Enterprise Linux 8.8 Extended Update SupportRed Hat	0:1.12.0-15.el8_8.12 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:1.14.1-1.el9_5.1 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:1.20.11-28.el9_6 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:23.2.7-3.el9_6 and laterNot affected
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat	0:1.11.0-22.el9_0.13 and laterNot affected
Red Hat Enterprise Linux 9.2 Extended Update SupportRed Hat	0:1.12.0-14.el9_2.10 and laterNot affected
Red Hat Enterprise Linux 9.4 Extended Update SupportRed Hat	0:1.13.1-8.el9_4.5 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 8Red Hat

References

RHSA-2025:2500vendor-advisory
RHSA-2025:2502vendor-advisory
RHSA-2025:2861vendor-advisory
RHSA-2025:2862vendor-advisory
RHSA-2025:2865vendor-advisory
RHSA-2025:2866vendor-advisory
RHSA-2025:2873vendor-advisory
RHSA-2025:2874vendor-advisory
RHSA-2025:2875vendor-advisory
RHSA-2025:2879vendor-advisory
RHSA-2025:2880vendor-advisory
RHSA-2025:3976vendor-advisory
RHSA-2025:7163vendor-advisory
RHSA-2025:7165vendor-advisory
RHSA-2025:7458vendor-advisory
https://access.redhat.com/security/cve/CVE-2025-26596vdb-entry
RHBZ#2345256issue-tracking
https://lists.debian.org/debian-lts-announce/2025/02/msg00036.html

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